Gearing.



UNITED STATES PATENT OFFICE.

FRED K. HENDRICKSON, 0F WORCESTER, MASSACHUSETTS, ASSIGNOR TO PREN'IICEBROS. COMPANY, A CORPORATION OF MASSACHUSETTS.

GEARIN G.

Specification of Letters Patent. Application filed December 27, 1909.

' To all whom it may concern:

Be it known that I, FRED K. HENDRIOK- soN, a citizen of the UnitedStates, residing at Worcester, in the county of NVorcester and State ofMassachusetts, have invented a new and useful Gearing, of which thefollowing is a specification.

The principal objects of the invention are to provide a simplified andcompact form of gearing for the purpose of retracting the spindle at agreater speed than that with which it is fed forward and to providemechanism for accomplishing this of such construction that it is veryeasily manipulated and involves a minimum number of gears, taking upvery little space on the machine.

Further objects and advantages of the invention will appear hereinafter.

Reference is to be had to the accompanying drawings, in which- Figure 1is a side elevation of a portion of an upright drill partially incentral vertical section with a preferred form of tapping attachmentapplied thereto. Fig. 2 is an end elevation of a portion thereof, andFig. 3 is a plan of a detail of the clutch lever.

The invention is shown as applied to an upright drill having a frame 10most of which is constructed in a well known manner. On this frame isbolted a member 11 which with the frame constitutes the bear ing for thedriving shaft 12. On the driving shaft is a beveled pinion or gear 13which constantly meshes with a larger beveled gear 14 which is providedwith a hub 15 project ing through a bushing 16 in ing 17 on the frame.Through the center of this gear 14 and its hub passes the tap pingspindle 18 on which the gear 14 is free to rotate.

Pivotally mounted on a shaft or stud 20 at the upper part of the frameis a swinging frame 21 which is provided with a bearing 22 having abushing '23 therein and in which rotates the hub of a beveled gear 24which is adapted to mesh with the gear 14 when the frame is swung toproper position. This frame is manipulated by means of an arm 25projecting downwardly therefrom. This arm is provided with a bolt 26passing through a slot 27 in an arm 28 bolted to the frame 10. The slotis provided with two recesses 29 for receiving the round head of thebolt. These recesses are the same shape a vertical bearas the head sothat the arm and frame 21 can be fixed in two positions in one of whichthe gear 24 meshes with the gear 14 and in the other of which it isclear of it. On the upper part of the member 11 also is a bearing 30provided with a bushing 31 for receiving the hub of a small beveled gearor pinion 32 which is loose on the spindle l8 and meshes with the gear24.

The gears 14 and 32 have upper and lower clutch teeth 33 and 34,respectively, and slidably mounted on the spindle is a clutch member 35having clutch teeth adapted to engage either of the above mentioned setsof clutch teeth. A lever 36 connected with a yoke 38 is employed foroperating the clutch. This is pivoted on a project-ion 37 on the frame10.

The operation is as follows :Power can always be transmitted from thegear 13 to the loose gear 14 in all positions of the parts. When theparts are in the position shown in Fig. l, the clutch can be moved fromthe neutral position shown to that in which it engages the teeth 33.Then power is transmitted directly to the spindle. In this way thespindle is rotated forward at a relatively low rate of speed fortapping. To reverse the spindle, it is only necessary to reverse thelever 36 so as to engage the clutch with the teeth 34 and then as thegear 14 is loose on the spindle, power is transmitted through thegear'24 to the gear 32 and then through the clutch to the spindle toreverse the rotation thereof at a high speed. If it is desired to throwthe attachment out of operation and operate the spindle in the usual wayfor drilling, the bolt 26 is loosened, the arm 25 moved to the leftuntil the bolt head comes into the front socket and the bolt istightened up again to hold the gear 24 in inoperative position. In thatcase the clutch is left down and the spindle raised by hand in the usualway to withdraw the drill, or otherwise manipulated in accordance withordinary conditions. By this construction the large number of spur gearsordinarily used for withdrawing the tapping spindle at a high speed areavoidedand at the same time a most simple and compact mechanism isemployed for securing these results, in which the intermediatetransmitting gear is independent of the driving shaft and is not rotatedthereby when the tapping attachment is not in use.

7 beveled gear thereon, a spindle,

gears on While I have illustrated and described a preferred form of theinvention, I am aware that many modifications can be made therein by anyperson skilled in the art without departing from the scope of the inifention as expressed in the claims. Thereore, details of constructionshown and described but What I do claim is p 1. The combination with adriving shaft and a spindle at right-angles thereto, of a beveled gearon the driving shaft, two beveled gears on the tapping spindle rotatableindependently thereof and of different sizes, the large one meshing withthe gear on the driving shaft, a gear for transmitting power from one ofsaid two gears on the tapping spindle to the other, and means wherebyeither one of the gears on the "spindle can be connected therewith fordriving it.

2. The combination of a driving shaft, a a beveled gear rotatablymounted on the spindle and meshing with the first named gear, a beveledgear meshing with the beveled gear on the spindle and movable out ofmesh therewith, another beveled gear on the spindle meshing with thelast named beveled gear and rotatable independently of the spindle, andmeans for connecting either of said beveled gears on the spindle withthe spindle.

3. The combination with a driving shaft and a tapping spindle atright-angles thereto, of a beveled gear on the driving shaft, twobeveled gears on the tapping spindle rotatable independently thereof andof different sizes, the large one meshing with the gear on the drivingshaft, a gear for transmitting power between the two gears on thespindle, means whereby either one of the the spindle can be positivelycon- 'movably mounted on I do not w1sh to be limited to all the nectedtherewith for driving it, a frame the frame of the drill on which saidtransmitting gear is mounted, and means for fixing said frame in twopositions on the drill frame in one of which the gear carried by itmeshes with both the gears on the spindle and in the other of which itis out of mesh with the larger one.

4;. The combination of a frame, a spindle, two gears loosely mountedthereon each having clutch teeth, a frame pivotally mounted on theframe, a gear on said frame adapted to mesh with both of said gears, ahandle rigid on said pivoted frame for moving it so. as to bring thegear thereon into and out of mesh with one of said gears on the spindle,means on the frame for locking the pivoted frame in each of saidpositions, a clutch member adapted to connect the spindle with eitherone of the gears, and a lever for operating said clutch member locatedadjacent to, and parallel with, said arm.

5. The combination of a frame, a spindle, two bevel gears of differentsizes rotatable independently of each other and of the spindle, a framepivotally mounted on the frame at a point just beyond the smaller ofsaid gears and on the axis of said spindle, a bevel gear on said frameadapted to mesh with both of said gears, an integral handle on saidpivoted frame for moving it so as to bring the gear thereon into and outof mesh with the larger of said gears, and means for connecting thespindle with each one of the bevel gears thereon.

In testimony whereof I have hereunto set my hand, in the presence of twosubscribing witnesses.

FRED K. HENDRICKSON.

Witnesses:

ALBERT E. KAY, C. Fomuss'r WESSON.

Gopies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents.

Washington, D. G.

